Indoor radon in nakornpathom province, Thailand.

During the months of July and August 1997, a survey to determine the existence of indoor radon was carried out, using an activated charcoal technique, in 474 different buildings in Nakornpathom Province. The presence of radon gas was encountered inside all the buildings investigated, varying in concentration from 4.00 to 86.40 Bq.m-3 (13.45 + 9.23 Bq.m-3). With regard to the type, age and ventilation status of the buildings, and the practice of smoking indoors, the findings do not conclusively support the notion of their contributing to, or mutually associated with, indoor gaseous concentrations of radon.